package spec.ganlijuan.unit5;

public class IncludeClassTest {
    public static void main(String[]args){
        double d=Math.sin(Math.PI/5);
        System.out.println(d);
        System.out.println(Math.sqrt(1000));

//        StringBuffer sb=new StringBuffer(5:"abcdefg");
//        System.out.println(sb.length());
//        System.out.println(sb);
//        sb.insert（）；

    }
}

